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Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Extra Electron Diffraction Spots Caused by Fine Precipitates Formed at the Early Stage of Aging in Al-Mg-X (X=Si, Ge, Zn)-Cu Alloys
Kenji MatsudaAkihiro KawaiKatsumi WatanabeSeungwon LeeCalin D. MarioaraSigurd WennerKatsuhiko NishimuraTeiichiro MatsuzakiNorio NunomuraTatsuo SatoRandi HolmestadSusumu Ikeno
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2017 Volume 58 Issue 2 Pages 167-175

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Abstract

Age-hardenable Al-Mg-Si, Al-Mg-Ge, and Al-Zn-Mg alloys including Cu were investigated by transmission electron microscopy to understand extra diffraction spots that appear in their selected area electron diffraction patterns. These alloys containing Cu exhibit similar extra diffracted spots to each other with diffracted spots or streaks for Al matrix and major precipitates in each alloy. The extra spots cannot be confirmed in Cu-free alloys. The initial cluster, which is based on the β''-phase in the Al-Mg-Si alloy, is proposed to be MgSi(/Ge)Mg, CuMgSi(/Ge), AlCuMg, and AlZnMg, while the second clusters, which consist of three initial clusters including anti-phase boundary short-range order, are proposed for Cu-containing alloys.

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© 2016 The Japan Institute of Light Metals
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